Method for controlling foaming of desulfurization slurry through front-end co-processing

Abstract

The invention relates to a method for controlling foaming of desulfurization slurry through front-end co-processing. The method comprises the following steps: step 1, tempering boiler flue gas duringfoaming under the synergistic effect of environment-friendly equipment in front of a desulfurization absorption tower in an ultralow emission system; and step 2, when the condition that the desulfurization slurry bubbles is found, measuring the ammonia nitrogen content in the desulfurization wastewater through an online ammonia nitrogen meter for the desulfurization wastewater. The method has thebeneficial effects that the synergistic effect of the existing environment-friendly equipment in front of the desulfurization absorption tower of the ultralow emission system is utilized to carry outtempering treatment on the boiler flue gas during foaming, including flue gas temperature, dust content, ammonia escape concentration and the like, so that online emergency treatment of desulfurization slurry foaming is realized; the main reason of abnormal slurry foaming is specifically and rapidly analyzed, slurry foaming is timely, automatically and cooperatively adjusted and treated, and desulfurization efficiency reduction and discharge index standard exceeding abnormity caused by foaming are avoided; the workload of manual overflow foam cleaning is reduced, and the influence of overflowon the production environment is reduced.

Description

technical field [0001] The invention belongs to the field of desulfurization, and in particular relates to a method for controlling foaming of desulfurization slurry in front-end co-processing. Background technique [0002] Sulfur dioxide (SO 2 ) is the main gaseous pollutant in the atmospheric environment, and it is also one of the main emission control indicators for ultra-low emission of flue gas. Among the ultra-low emission technology routes for coal-fired power plants, the limestone-gypsum wet desulfurization system is the most widely used, and its main advantages are mature technology, strong adaptability to coal types and deep desulfurization potential. The ultra-low emission process of a typical coal-fired power plant is as follows: the high-temperature flue gas from the boiler body passes through the SCR denitrification device to remove nitrogen oxides NO in the flue gas x , and then go through the air preheater to remove the flue gas cooler to cool below the aci...

AI Technical Summary

Problems solved by technology

Under normal circumstances, the bubbles on the surface of the slurry will quickly break and disappear, but under abnormal conditions, these bubbles not only do not disappear, but also accumulate more and more to form foam overflow

[0004] There are many factors affecting the foaming of the desulfurization absorption tower slurry; such as the enrichment of surfactants and organic matter, the complex complexation of metal ions, the influence of soot impurities, ammonium ions, etc. Due to different characteristics, limestone and desulfurization make-up water quality fluctuations, etc., it is difficult to completely eliminate the foaming of the desulfurization absorption tower slurry, and even affect the desulfurization efficiency in the case of severe foaming and overflow, which does not meet the requirements of on-site civilized production

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